Alert archive / Iowa / Severe Thunderstorm Watches in 2016

Severe Thunderstorm Watch 225

May 28, 20165 states

The Storm Prediction Center issued this severe thunderstorm watch at May 28, 2016, 1:37 PM CDT for 5 states. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
May 28, 2016, 1:37 PM CDT (18:37 UTC)
Expired
May 28, 2016, 9:00 PM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt
All 116 counties

Allamakee County, IA, Benton County, IA, Black Hawk County, IA, Bremer County, IA, Buchanan County, IA, Butler County, IA, Cedar County, IA, Cerro Gordo County, IA, Chickasaw County, IA, Clayton County, IA, Clinton County, IA, Davis County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Fayette County, IA, Floyd County, IA, Grundy County, IA, Hancock County, IA, Henry County, IA, Howard County, IA, Iowa County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Mahaska County, IA, Mitchell County, IA, Muscatine County, IA, Poweshiek County, IA, Scott County, IA, Tama County, IA, Van Buren County, IA, Wapello County, IA, Washington County, IA, Winnebago County, IA, Winneshiek County, IA, Worth County, IA, Adams County, IL, Boone County, IL, Brown County, IL, Bureau County, IL, Carroll County, IL, DeKalb County, IL, Fulton County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, Knox County, IL, Lee County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McHenry County, IL, Mercer County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Schuyler County, IL, Stark County, IL, Stephenson County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Winnebago County, IL, Woodford County, IL, Dodge County, MN, Faribault County, MN, Fillmore County, MN, Freeborn County, MN, Houston County, MN, Mower County, MN, Olmsted County, MN, Steele County, MN, Wabasha County, MN, Waseca County, MN, Winona County, MN, Clark County, MO, Lewis County, MO, Adams County, WI, Buffalo County, WI, Columbia County, WI, Crawford County, WI, Dane County, WI, Dodge County, WI, Fond du Lac County, WI, Grant County, WI, Green County, WI, Green Lake County, WI, Iowa County, WI, Jackson County, WI, Jefferson County, WI, Juneau County, WI, Kenosha County, WI, La Crosse County, WI, Lafayette County, WI, Marquette County, WI, Milwaukee County, WI, Monroe County, WI, Ozaukee County, WI, Racine County, WI, Richland County, WI, Rock County, WI, Sauk County, WI, Sheboygan County, WI, Trempealeau County, WI, Vernon County, WI, Walworth County, WI, Washington County, WI, Waukesha County, WI

The radar

The La Crosse radar (KARX), 135 km from the middle of the area, began a volume at 18:37 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
20%
One or more EF2 to EF5 tornadoes
5%
Ten or more severe wind reports
50%
One or more gusts of 65 knots or more
5%
Ten or more severe hail reports
50%
One or more hailstones of 2 inches or more
5%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

19 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
May 28, 2:40 PM CDTSevere Thunderstorm WarningDVNCedar, Delaware, Dubuque, Jones50 min
May 28, 3:38 PM CDTSevere Thunderstorm WarningLSXAdams37 min
May 28, 4:06 PM CDTSevere Thunderstorm WarningARXGrant27 min
May 28, 4:13 PM CDTSevere Thunderstorm WarningMKXIowa, Lafayette47 min
May 28, 4:25 PM CDTSevere Thunderstorm WarningDVNRock Island50 min
May 28, 4:33 PM CDTSevere Thunderstorm WarningMKXLafayette27 min
May 28, 4:59 PM CDTSevere Thunderstorm WarningMKXDane, Iowa, Lafayette, Sauk31 min
May 28, 5:29 PM CDTSevere Thunderstorm WarningMKXColumbia, Dane, Iowa, Sauk31 min
May 28, 5:59 PM CDTSevere Thunderstorm WarningMKXColumbia, Dane, Sauk31 min
May 28, 6:52 PM CDTSevere Thunderstorm WarningLOTOgle, Winnebago38 min
May 28, 6:59 PM CDTSevere Thunderstorm WarningMKXJefferson, Rock31 min
May 28, 7:05 PM CDTSevere Thunderstorm WarningMKXDodge, Fond du Lac, Green Lake25 min
May 28, 7:09 PM CDTSevere Thunderstorm WarningMKXRock36 min
May 28, 7:32 PM CDTSevere Thunderstorm WarningMKXJefferson, Rock, Walworth28 min
May 28, 7:42 PM CDTSevere Thunderstorm WarningLOTDeKalb, LaSalle, Lee48 min
May 28, 7:49 PM CDTSevere Thunderstorm WarningMKXJefferson, Waukesha26 min
May 28, 8:22 PM CDTSevere Thunderstorm WarningILXMason, Tazewell23 min
May 28, 8:22 PM CDTSevere Thunderstorm WarningLOTDeKalb23 min
May 28, 8:24 PM CDTFlash Flood WarningILXMason3 hr

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 6.6 hours before the alert went out and 143 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Davenport, at 12:00Z on 2016-05-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 48 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 12:00Z on 2016-05-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 78 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
48 J/kg
Mixed-layer CIN
-32 J/kg
Mixed-layer LCL
591 m above ground
0-6 km bulk shear
38 kt
0-1 km storm-relative helicity
78 m²/s²
0-3 km storm-relative helicity
112 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 28, 12:37 PM CDTMesoscale DiscussionSPCAdams, Hancock, Henderson, Mercer, Rock Island113 min
May 28, 3:09 PM CDTMesoscale DiscussionSPCAdams, Brown, Hancock, Pike, Schuyler2 hr
May 28, 5:33 PM CDTMesoscale DiscussionSPCBureau, Carroll, Fulton, Hancock, Henderson, Henry and 15 more57 min

Nearby

Severe Thunderstorm Watches in Iowa, 2016Severe Thunderstorm Watches in Wisconsin, 2016Severe Thunderstorm Watches in Illinois, 2016Every severe thunderstorm watch in 2016

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.